Fiio E6 Initial Battery Charge

Just received my E6 from HiFi Headphones. Anybody know how long the initial charge should take? I've had it plugged into the PC and the red light flashing away for most of the last couple of hours, and it switches on and works fine whilst it's plugged in, but the moment I unplug it it won't even switch on?

Also, I listen to music though a set of Phonak Audeo PFE022's from my Samsung Galaxy S2, and mostly what I wanted was some more volume - I have to max out the volume and mixer when I'm on the train otherwise music is very quiet - I use poweramp on the phone. I'm only seeing a relatively small volume boost out of the E6. I still end up maxing everything out even sitting here at home. It is louder doing side by side tests, but not by very much. Is that normal?